sms_autofill

Flutter plugin to provide SMS code autofill support.

For iOS, this package is not needed as the SMS autofill is provided by default, but not for Android, that's where this package is useful.

No permission to read SMS messages is asked to the user as there no need thanks to SMSRetriever API.

Usage

You have two widgets at your disposable for autofill an SMS code, PinFieldAutoFill and TextFieldPinAutoFill.

Just before you sent your phone number to the backend, you need to let know the plugin that it need to listen for the SMS with the code.

To do that you need to do:

await SmsAutoFill().listenForCode;

This will listen for the SMS with the code during 5 minutes and when received, autofill the following widget.

PinFieldAutoFill

PinFieldAutoFill(
                decoration: // UnderlineDecoration, BoxLooseDecoration or BoxTightDecoration see https://github.com/TinoGuo/pin_input_text_field for more info,
                currentCode: // prefill with a code
                onCodeSubmitted: //code submitted callback
                onCodeChanged: //code changed callback
                codeLength: //code length, default 6
              ),

TextFieldPinAutoFill

TextFieldPinAutoFill(
                decoration: // basic InputDecoration
                currentCode: // prefill with a code
                onCodeSubmitted: //code submitted callback
                onCodeChanged: //code changed callback
                codeLength: //code length, default 6
              ),

Android SMS constraint

For the code to be receive, it need to follow some rules as describe here: https://developers.google.com/identity/sms-retriever/verify

Be no longer than 140 bytes
Begin with the prefix <#>
Contain a one-time code that the client sends back to your server to complete the verification flow
End with an 11-character hash string that identifies your app

One example of SMS would be:

<#> ExampleApp: Your code is 123456
FA+9qCX9VSu

Helper

PhoneFieldHint [Android only]

PhoneFieldHint is a widget that will allow you ask for system phone number and autofill the widget if a phone is choosen by the user.

Custom CodeAutoFill

If you want to create a custom widget that will autofill with the sms code, you can use the CodeAutoFill mixin that will offer you:

listenForCode() to listen for the SMS code from the native plugin when SMS is received, need to be called on your initState.
cancel() to dispose the subscription of the SMS code from the native plugin, need to be called on your dispose.
codeUpdated() called when the code is received, you can access the value with the field code.

App Signature

To get the app signature at runtime just call the getter getAppSignature on SmsAutoFill. You can also find the sample code in example app.

knvpk/sms_autofill